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Compressor air cooling

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Tom

10-11-2001 08:08:40




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Need some advice from all of the experts out there! I have seen many people plumb lengths of black pipe out of the air tank of air compressors to cool down the hot air so that water separators are able to do their job. I noticed that most of the problem with the air getting hot is between the compressor itself and the air tank, as this very short tube gets REALLY HOT. What do you all think about replacing the short tube with 20 feet or so of copper line. This would dissipate a lot of heat even before the air got into the tank. Would this hinder the performance of the compressor, ie. change the CFM rating or the like. Would the 1/2" copper tubing be at risk of bursting under pressure? Thanks for all of your opinions!

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Bob M

10-11-2001 17:26:31




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 Re: Compressor air cooling in reply to Tom, 10-11-2001 08:08:40  
Tom - If your goal is to get the air as dry as possible (i.e. to wring out as much water as possible) remember this: The HIGHER the air pressure and the LOWER the air temperature, the more water you'll get out. As you have observed, the air's hottest right out of the pump head. It then cools to near ambient in the receiver tank. Therefore if you want to get still more moisture out, you need to cool the air after it leaves the receiver, but before it passes thru any pressure reduction device.

When I spray paint, I run the air from the receiver tank thru an old transmission cooler coil immersed in a tub of ice water. The air then passes thru a regular filter, a coalescing filter (removes small droplets) and finally a dessicant filter. It then passes thru the sprayer regulator to reduce the pressure to whatever level the paint gun needs. Finally it passes thru a 2nd tranny cooler coil immersed in a bucket of HOT water to warm the air back up before it goes to the spray gun.

You'd be amazed at how much water collects in first two filters over the course of an hour of spraying. Better to have it show up there than in the paint!

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Franz

10-11-2001 16:47:19




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 Re: Compressor air cooling in reply to Tom, 10-11-2001 08:08:40  
The trick is to cool the air as quickly as possible, to cause the moisture to condense onto the walls of the moisture seperator.
You have the right idea on where you can do it most efficiently, but the wrong idea on how to do it.
The most effective way is with a 3' vertical pipe, 2" in diameter. You pipe the incoming air into the pipe about 19" up, turning the air downward, and pipe from the top of the seperator to the tank. On the bottom, install a drain valve.
This type of seperator will take 75% of the water out of the air.

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